Ditto only appears at the Trophy Garden on certain days.
You can catch other rare Pokemon there on other days.
Hope this helped! =)
(Even on the right day Ditto is rare.)
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At the trophy garden, rarely. it's in Pokemon platinum.
The Trophy Garden is the only place to get Ditto in Pokemon Platinum, without trading or cheating of course.
You can find it at random days in Pokemon Mansion in route ---, talk to Butler (or whatsoever) and he will say random Pokemon is in the garden, if is ditto, go get it!
You can not get a Turtwig egg in Pokemon Platinum. But if you breed a Turtwig with a Ditto, then it is possible.
from what i know, you can't. srry. :) but you might get lucky and find someone. from: flyguy007 Hi this is flyman1111 i think you can duplicate items in Pokemon platinum all you have to do is get a ditto and a Pokemon with thief make sure the Pokemon with thief is holding the item you want to duplicate then you get into a double battle use thief on ditto and ditto will have the item that the Pokemon with thief has =] hope it has helped and worked